Magneto-generator



P. VAN S.` KQLFF.-

MAGNETO GENERATOB. ,APPucATloNrlLfn SEPT. 14, 1914.

I. Patented Aug. 1, 1916.

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UNITED STATES .PATENT OFFICE.-

PETRUs van SANTEN xoLr.ORMOYLAN,rRNNsYLvANIA. AssIGNOR, BY MESNE ASSIGNMENTS, To `THE ELECTRICy TACHOMETER CORPORATION, A CORPORATION i OF DELAWARE.

MAGNETO-GENERATOR.

Specicaton of Letters Patent.

Application led September 14, 1914. Serial No. 861,544.

T o all whom it may conce-rn 'Be it known that I. PETRUS vAN SANTEN KOLFF, a citizen of the United States, residing at Moylan. in the county of Delaware7 State of Pennsylvania, have invented certain new and useful Improvements in Magneto-Generators, of which the following is a specification. Y

My invention broadly stated relates to means for varying and controlling the strength of current delivered from a inagneto generator and it has' for its object to provide an improved construction of means whereby such variation and control of current delivered from the generator may be effected.

More specifically stated. my invention has for its object to provide an improved construction of means whereby the poles of a magnet may be adjusted toward and from the revoluble armature of the generator, such adjustmentsfcausing variations in the .current generated and delivered.

In order that my invention may be more readily comprehended and understood reference should be had to the accompanying drawing in which I have illustrated one form of a convenient embodiment of my invention but it will be understood that changes in the details of construction may be made within the scope of the claims without departing from my invention.

In the drawings Figure 1 is a transverse sectional view of `the casing and inclosed parts of the generator embodying my invention; and Fig. 2 is a horizontal sectional view of a portion of the said device, parts of said device being broken away and omitted.

Referring to the drawings` l designates what ma be termed the body portion of the casingoo a magneto, the open top of which is closed by means of the cover 2, the latter being secured to the top edge of the body portion of the casing by means of screws 3. The body part l and the cover 2 consist of brass or other non-magnetic material and together constitute the complete casing. In Order to insure that the joint between the abutting edges of the body and top or cover portions l and 2 of the casing shall be watertight -I provide a washer 4 of suitable material such as fiber which is interposed between the said edges. y

For the purpose of securing the magneto 4upon a wall or other suitable supporting structure I have provided the body portion thereof at its base or bottom with lugs having holes therethrough through which securing screws or bolts may be inserted.

G. designates a' permanent magnet of horseshoe type, the poles T and S of which are situated upon opposite sides of and partially surround anarmature. 10 of any suitable known construction which is supported upon a revoluble shaft 11 sustained in any known' manner.

The magnet ('3 is supported andheld in position by means of vertical ianges T0 which project inwardly from two opposing walls of the part 1 of the magneto casing. There are two of these projecting flanges upon each opposing wall and they are spaced from cach other distances equal to the width of the end portions or poles of the magnet so that such end portions may be positioned between and sustained by the said flanges, as illustrated in the drawings.

For the purpose of varying and controlling the current which is delivered from the generator I provide means for adjusting the poles T and of vthe magnet toward and from the armature l() which means may be described as follows: The pole portions or sections of the magnet are of arc shape the inner sides of the said arcs subtending opposing portions of the armature.l The outer sides or surfaces of the pole portions of the magnet are also curvilinear or arcuate in shape. as is clearly indicated in Fig. 3 of the drawings. T2 designates blocks of brass or other non-magnetic materiall which are situated in the space between the walls of the lnagneto casing and the arcuate or curvilinear pole portions of the magnet. These blocks are situated above a horizontal plane passing through the curvilinear pole portions of a magnet 'at the point of greatest Patented Aug. 1. 1916. j

and S to approach each other and thereby reduce the air gap or space between the said poles and arlnature the number of lines of magnetic `force which are cut or interrupted by the revolving armature will be increased. The greater the number of lines of force cut the stronger will be the current which is delivered from the magneto. If, however, the bolts 73 are turned in the opposite direction so as to permit the poles T and 8 to move away from each other and thereby increase the air gapror space between the said poles and the armature the number of magnetic lines ofV force which will be cut by the latter will be reduced with a consequent reduction in the current delivered therefrom. This adjustment majv be employed to effect accurate calibration of a milli-volt-meter, or for an)VY other purpose desired.

The plate or bar Tl of soft iron or equivalent material provided as a shield or pro- 'tector to prevent a change in the flux passing through the armature in case the magnet should be placed or seated upon a magnetic metallic support. f

I claim l. In a magneto, the combination of a revoluble armature, a magnet having its poles situated upon opposite sides of the said armature, walls spaced from the poles of said magnet, and adjustable means interposed between the said poles and said walls for adjusting the said poles with relation to the said armature, for the purpose stated.

In a magneto, the combination of a casing having flanges upon opposing sides thereof. a horseshoe magnet having its poles situated between the said flanges. the said magnet being supported by the said flanges,

a revoluble armature interposed between the 40 ment of the said poles with relation to the 5 said armature for the purpose stated.

3. In a magneto, the combination of a casing haring parallel flanges upon the opposite walls thereof, a magnet of horseshoe t vpe having its poles projected into the 5o spaces between the said flanges and being supported thereby, an armature situated between Ihe said poles, blocks interposed between the opposite poles ot' said magnet and the opposing walls of said casing interme- 55 diate the said flanges. the inner ends of said blocks being beveled and resting against the outer surfaces of the said poles, adjusting screws projecting through the bottom of the said -asing and being in engagement with 0 the said blocks for adjusting the same to cause adjustment of the said poles with relation to the said armature, for the purpose stated.

In testimonjv that I claim the foregoing 45 as in v invention, I have hereunto signed my name this 11th day of Sept., A. D. 19H.

PETRS van, SANTEN KOLFF.

In the presence of FLORENCE Dnxeox, CARRIE E. KLEINFELDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

